fix(agentstack): require agent DIDs for registration

Author: rissrice2105-agent

packages/agentstack/src/index.test.ts

@@ -132,6 +132,7 @@ describe("AgentStack coordinator", () => {
   it("rejects unknown agents and invalid DIDs", () => {
     const stack = new AgentStack();
     expect(() => stack.createTask({ ownerDid: "nope", sourceApp: "x", title: "t" })).toThrow();
+    expect(() => stack.registerAgent({ ...agent, did: userDid("not-an-agent") })).toThrow(/Invalid agent DID/);
     const task = stack.createTask({ ownerDid: owner, sourceApp: "x", title: "t" });
     expect(() => stack.assignTask(task.id, agentDid("ghost"))).toThrow(/Unknown agent/);
   });

packages/agentstack/src/index.ts

@@ -76,11 +76,12 @@ export class AgentStack {
     return `${prefix}_${this.seq}`;
   }
 
-  registerAgent(agent: AgentProfile): AgentProfile {
-    if (!parseDid(agent.did)) {
-      throw new Error(`Invalid agent DID: ${agent.did}`);
-    }
-    this.agents.set(agent.did, agent);
+  registerAgent(agent: AgentProfile): AgentProfile {
+    const parsed = parseDid(agent.did);
+    if (!parsed || parsed.kind !== "agent") {
+      throw new Error(`Invalid agent DID: ${agent.did}`);
+    }
+    this.agents.set(agent.did, agent);
     this.emit({ type: "agent.registered", agent });
     return agent;
   }